Diesel is a brand of American ultra-high-proof neutral grain spirits (often categorized or sold under the vodka umbrella) that is widely available in a 1-Liter (1L) bottle size. Because it is an odorless, colorless, and extremely potent liquid distilled from 100% grain, it is rarely consumed straight. Instead, it is heavily used as a base alcohol for home infusions, herbal remedies, punch bowls, or making DIY vanilla extracts.